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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7904bdaa3dd1a5c81f390ab5c5301786382b5b819050f69ab544f9a907cc3ba' 
  AND token = 'TcWi4eq+zWaGAz41mPWPLKwI10AhoJjLkPf4r+NNZC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}