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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ac4ba6ad122e59fef1ff15a80a4bff63483988e17c93ca128c06bda8af58a9' 
  AND token = 'fp59ALk9XvBnxR9Xa85jPzHKMW/sPobKB4/qvyRn9ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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