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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d6385d08a7f20ee460e32d7717b6a723488161da519fb08387525e6132328b' 
  AND token = 'SHkh7c7sXEoRGZVM5JF8qRSdZGtOCydOjgI2jjqY0sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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