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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2843423bb78fd93dd8facb452e1ddf1a701fd12724726f906730caad6966e87a' 
  AND token = 'A9+iFRikFw3FRl6crCsSnpzK+M8iDXpPFg659NgoCgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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