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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4dfbde523c059278a7d650ea7ba312b09eb3da275038a70d922010c9c18a9b' 
  AND token = 'BNsyaYIFGsaZMinWPLYNl17MNk5hO+bD44R9aPcp16g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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