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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afa7b5becd09570db89d8f3cad9ac983e0d5775c7a9df7744cf3bec3c6780e6' 
  AND token = 'YKH9tCFIo7D4Ow0MpB9lDWTcLK3TBWHW4GAIU5UM8q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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