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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fad23bdb966fb87081fcd8c6799df124a045b5f27fd7b501ee38865ba40745' 
  AND token = 'Z3Z6JI6keyl4C8dMAeRzoaGDruEnaSoKb07t8pNrY+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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