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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39835248bcb470d1f5371a5f70f80e2eb9fda1218b1ca6673c0b3c2d00fac14a' 
  AND token = 'eQktH6NxqCsUbVRHRy2Xa4qJd2p71R02yRq/wQ/7yqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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