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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720bcf7d8e6fc325ad1065c21570a28ed8cf947d41b91046451e8ab2ce74c4c4' 
  AND token = 'uv+36+x+MnUkYu5FJnQ7SicLMYExoHsCggkQ6zf4Xy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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