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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1220365f75c8c00e2bca11085cc743ba6beebda1a0e4f7931ec4d4fce876eb9' 
  AND token = 'u+QGczxLE4ExkiefhL3hm1bK1/7tkNbN0pmb93bL710=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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