SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bdad9a0fd8fc023b96ff78186c4a6cbb9700cea20941383c88a5667bbed97b' 
  AND token = 'vx4J1mw6mBWmTlYCJ3n/3VfFsYKY5vbU3Ge43xCwhW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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