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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee739e0709ed61432f05dd3604afd4eda9cceb88fddde5a41bcbd1733069564e' 
  AND token = 'mJGn/IPeqMuomT97+8zjQ4nMbO8AJegSh4/AoLABj8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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