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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104945853fdbf05db912b64a7201e2de81540f29461b12f4cba81ac9cf8ba931' 
  AND token = '3+Vh2jhepf0ig+N7U4ovG+3YRBWTIc3Shs84CDsVz6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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