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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec08133f1f503f624c0c27979e47eec3e06c64c899bdef69f58039cbcf2f052' 
  AND token = 'i6nhJ1FNZtvN5z1sjiXZfq7LlJWgnye3O4teglw8DAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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