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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9d99643e9bb67476756c0920780befb434baa66b9a77e2bdbb2b62a5e2e0fe' 
  AND token = 'Q/s1ZwpIdOfsQuJ1OYeXTgk23fgKagBhU08SaNLd3yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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