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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdafe9169340290ddc60500470c3d0f872664ce01c3e3716537bbae5c86ec03' 
  AND token = 'lEKtq5IDXCdP29XbK44FLJO/Q7pyO6EbFLwU5/e+huU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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