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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d574f8c2f5f422acb6357449d6ab7fbebbb25e60ab05d204a23927ce86c0f6b' 
  AND token = 'xIJalH+Kt4eRc/NKSRfihtuKpsyF/XnWl2Nk+jLJb2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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