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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5774bf66673e9f3b14acd81b952a2d20c4f34a7112eb8242e6163eacaa4af9' 
  AND token = '+jjw2gr55z6Z4yFWytombd3VQ2Bi8fbrCAgm1STvqZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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