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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad634999e141d9de3cfabf27065065375c2b177c5d5e722cb42e580c69dd0089' 
  AND token = 'DjvT534h94onXiA7iEVp/7CdGb/imwfJFsH3bEdwv7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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