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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32078e0be0fcc483780958287074296205014dde21f0970f9e282aef4b8e2db5' 
  AND token = 'WqoyaZVqCdOSesJ10KqDYv61SOIH5uEpbOMr2hRUALg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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