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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be7f26cca46a8ddfddf07aa4f79c99f2fd332b1b4982d523babab41a93479f8' 
  AND token = 'lS2EH3UD4hmULlM4iO6BhruCYSA5JK9fWSG0xzAM9MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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