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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa71d40de9f73df430ad60e35b8373145642d497fa5eb1f1d5122fd24b115c10' 
  AND token = '2Rj8/oIF5vcRVIdM1idjlBzaKFvtskubWice78uEN1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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