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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4b35e360e0263048530ea9970d0160b80629d967bd180f0879030a892261a5' 
  AND token = 'wzzN79m8bWgdODOPwi9fiCTBpRMrjjXy1dVZJcVNM4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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