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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3f4a6a9e01647148b5ed8f332236decd1646ea7f48263233b987f6cc780d21' 
  AND token = 'LeypBdZ6aqspbIDtd20GWR7IWy4iTMcjOSxD12tWCKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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