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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3e2a2dfae9d073e25a1f75e75f91e55b85658aa4176467d60f7b46040f6463' 
  AND token = '7WmkCYupeKxo0O+R+awaQSlBIWC+gJR6dx33kFMsqLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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