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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a40a79acd3a167a57431d1832edaa24937f47a6769424a58a46b1fefb274121' 
  AND token = 'q0GlzyLDzjKM9UjlEnLqj8NctRdLLlXwiRLSPDg3wMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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