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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fd6a2d202e1175d3ab699f5b6e35259969d851b338b05009c9f91b362c3059' 
  AND token = 'zNEsEA2nKpWlzFhYJ8oEQfXzfKHU2lwRc9kzgWb8bQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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