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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3626631d1361a8bed14828a8f1d89f9208036ecbab9842aec80e85920405a04' 
  AND token = '9BDQEtyRJ57ANkKMvUCQPvH2IztNYmDuaAJYnDTnIT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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