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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748badd7f7ab00001955d446fa85d533fc2e7e97c055353a5c4beb30d7c1700d' 
  AND token = 'dMU5gx/OuvsEFLRfO5gZacbwU0pIFBPonCnw+fsK9I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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