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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9668d9d6f965c4d000139148df1ceeaeaf4325a5325fd88ed45308bbd0a02eb' 
  AND token = 'yE/7vqqTkPuxjjfOJa0l4TYYpFBdgiQ07x4GqP/65J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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