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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06efd222838fd92877ec696dab700ab4f84303e997eefef7fefe36258000ff1' 
  AND token = 'MaXZe1TQUzjY0q1lUAy/snFgsSz1qtlNG5n7sY3eyq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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