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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946c2571a3ba389e2f22b262c063781fb8a47eb249a513735180179bbaa68326' 
  AND token = 'YG5QYBudWz7vaTuIpKvx/G0eboRODC5B2rRidhCHEKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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