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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de01725f57a60a6373b57e4a88a04a6ae50297a3dea73c3e7bab52b28a0fcb6d' 
  AND token = '8KI0b4K0umtk2hhCrN0ykRM9OzhoVj/sxbreMaSjbag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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