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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd60e114a5ce87a397adeac0de94e9241d410c294c98ae367163c9a7618adbca' 
  AND token = '5o3vG4qzMwrsk5O7vChJyBRW/pk4kdGBm8FXRPKjLe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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