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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176975caf98a3d8ae32e37b5be4ebce1144a084ea7e95020176beee6e7604541' 
  AND token = 'cp6CyhajTqDTwopuUNRERXjBRHM0LyoTeKek31DqjGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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