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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7016492f061156bf748e45b4983ccd7d5580f73b11fb1d276866fe796f3a9b5b' 
  AND token = 'K4qhKPPn3rf0lLvReRVLurh5gs5/bm74hIAX7ru/a0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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