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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e80cda2aeaebfacfa8b968e490b7050bd334d144b74c37ddb292d19f9207ab' 
  AND token = 'edyBggN1P0prjzpl2NrnASKnhlEC+jRoAEdH5qLmOe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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