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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ae138558f9500e439f6f4294270afc12e447c1c5c64e9f06822e5afe5b7fe0' 
  AND token = 'n5yLpIvXpvKYYhVvlfcKIlnsCJIZxbeIjik+W8qGvS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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