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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd79cf4450aaec208ac0a58c753decbbe60a0779dc4f7e8b7546773e34232db' 
  AND token = 'nnkx8DYVFZRc7twVHozRNC0qAg8qwbcMwSN+3hPRppQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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