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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553efdf1ba8809a7d4b4459b11d9b9f9f525530c880cd6a946d8089d97700249' 
  AND token = 'FdNthC2vUe1uPDaYtHq5JPqINzDnbc1zgDS3eIwYCrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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