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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6175df6e7215a9a538f3c70108605155a22eb25331bc7872a8b50556c5acb804' 
  AND token = '9DimslR1r3L/Z8YOTrPbzNQKTZ8cghHDnisHT/kuecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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