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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5b4d2f977da2fc6557e88e7c8b0aad3362b876aa0aad7ffd1d4dcc6411908a' 
  AND token = 'hqek5ZnAcxR6+cJ8scB3VRn059djT433FaYWNPqzAvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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