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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3e79a4c8b5f3efa51e96f067e6f3303c3d4789a1edbd4dcf680d20cbd0f1b3' 
  AND token = 'PAWMOyMp9UL8ZDUwYRPSn9orZiDPWGna6erqwFOsyqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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