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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8236f7a2f1e20097601798632d0be73cbdf2201b8805830cef46f9184518beb1' 
  AND token = 'teG8rBkFFNltgvW8WwKz0oOA18yzmVKuqYaglkRk/Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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