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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c50c9b00ae4da9310180d3a249810f60cff6e1399eb863d4ab2c13cbd391999' 
  AND token = 'Ifpq8XOtymaFE3U4y9kh4kGpikvI4m2W7c7LgiJ/l6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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