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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc0aeef03948ff39d71774df38d89d88dd566c7f81fd68bfc81ed4b2300deae' 
  AND token = 'ixiDtkvrKMzy6g/ad00Hv0ri4BqGiukTgWkmQvdUKf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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