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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b0443339c31db457bc68e45f05774d1f52a6201b10ee269f67f3696003a693' 
  AND token = '/ofhToEBxyTRZOBbHldFE4pREv36ML/ouRC0mp4zqbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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