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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1198e23458b966270322aa7c4f3c97f99e6d85a7164ff9da2207f6e744cc0b' 
  AND token = '+6r7zetkDzNvSB9Shued8cby2gcfSblw6zVL086ahFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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