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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab283708c702dc489c6bb3a4d4f24bbe0cc4b7e7063acb51d304882fed0560e' 
  AND token = 'BHh+b0i2igQyC+4MikE1gP+130PMTxr1w8X6d8qfuAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00140

JSON explain

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