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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492f0d65dc24dafcdd8a5bb6c947b9c4a93ed19501d4567cde40f34c6ee3ab52' 
  AND token = 'dP8/VaCvRsri52+08aryz2p1xjDQFONlCPkOq6Ekam0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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