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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad16524300028b96ce7321a2ff778e20392597f86c16a6c69f6f203d396f928f' 
  AND token = 'XUS2YZp4ftQpMAFYALklHxwl7T3u1J8mPI8RRErOCG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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