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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8d99631df554473fd10f897c073be0e3487eed9f707ae760e03eb0fb7ae83d' 
  AND token = 'BYLEsUc1SIbnmw5CLdEnN1/7xwcPjmntPy09DUFDS6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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