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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1aa984ca9acf742b8f315b3d30867958f9e3917331728c039810da1fa8aab3b' 
  AND token = 'OWNEV9tPTS8dqjXd8fJ19+y9TOr8euL/15EOdAocKsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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