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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104e7d2ae3932924f3e80f4e15bd6362eb0b3529619153a8de0766f13a56d919' 
  AND token = 'S93mNHnuRhBd8H2bdFqzszkvUP1W5Q8RaKXlhXlWYoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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