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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcf3914e306068a4844aea12654cd3bf5a26d053e264ab3a6f85008f4f411c5' 
  AND token = 'GTjdASdUyAOpVoOr6zypbGiE6lpwAgNy8GeJkUqznJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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