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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab815dee40498e2adf45bd8e569a49a950d2e5fcb16ec47c421797a1ee10926' 
  AND token = 'bPRziDzWUxKD/e9781cKHES8/OGOT3JXCSsF3fqdu/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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