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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fffee4a526a02b3220bc354cd12df070707d8c9a59ad994501084ff7d14108b' 
  AND token = '3XSl9MJtsCnJcom1AxXr+8agjQYwCE1W14qjWxgVeI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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