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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f563ca80d5f5e752667bc7e854c51c44981da4e1d6d82c3f71ba4ba9a6d73f11' 
  AND token = '91705+IH9ACXTnjTlHHRrJsxdnsSmIwOxfEVtunfR3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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