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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8f9c8dd3c993479f59cee8daa6f56bd1f567c1fff04e9ba561b38647f2ee29' 
  AND token = 'GD+O6InnEfxjq0REYTTbmtXWM4Fdo3i/xn20eo1Txss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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