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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813aeaaa4134291474cf71de28470d8d597c821e6c6fa55e456411ecaca22a66' 
  AND token = 'GDEsEffTGkOl+LVJ151ZpW2TL9cwPvFTiCoY3lR8egM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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