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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ab4a6e8f8cf03565cb49560d12c9cbe1d98e439e2cb01ab3baa5426a6a988c' 
  AND token = 'Z2HsKZXwEEuppThLvTqb+5MwIAWzbk5L7LXviivFmJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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