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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb26a5d499ef2d4ddcbadcc8a8dede6c5f84e939f286629598ed06e70cfdc6e' 
  AND token = 'RCC03ypfW/XVpakxdFLzPPpo6SYxHg8/YthONihKaCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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