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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1163dbef763379bbace3e904dbdd6b39deef40d96ce88149c7ad769afc8f1e92' 
  AND token = 'WXpSfS2933R7YnQS/3yeB9f2y7ckcHR797ymFghjPl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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