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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cbf1018887fd095bb89c9626bb1a4f2d7cb30e36e37834cb638234f7e5172a' 
  AND token = 'N8oHXBCjUbQLwFLvkhm4rlxV9fQw3Yyfi6nxRR4RxKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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