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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a9a28f82d11ce899ebee17f8c429f0872fc111e2227533424744d4d9ed890b' 
  AND token = 'X9sfzYNHo5JnDIvPVdZ2RpnXRE6U51362TkRpDMAvU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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