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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8f2fddf647acc0523fe040b9c77d942095d794bb99624c29f70fa3d6fdf82f' 
  AND token = 'Sgk5irOxiO5tv/pGFixOnnjpEh6iV5d+H7E9sTTtm9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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