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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff02c5ab9cf16587b0ec272a78e708e7f7687de1e9d22b467359fe2b4660a2ff' 
  AND token = 'M0n935lLwsaafyzeH0OutF31GK0U0Xqn3mFTnr4xzFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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