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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf1545b0adee0dba252c06b3911900f1f6f2b47ad70bbfa62d9aedf7c1b5a4f' 
  AND token = 'dl7MZdwmdxByLUR9UlcJIRk/Vw67Kur1BG5MsNe4otI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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