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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09643803209cdf781f1f05167fa185b52387fdb0de93ad80a7593bb450444bf' 
  AND token = 'rtt2g+EO5AqDpbStRCQe6PJEP0hIqIe1PKfEedlCBuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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